/* タイトル画像ランダム表示 */
title_img=new Array();
	title_img[0]='http://watarublog.beadroads.com/style/archivetitle01.jpg';
	title_img[1]='http://watarublog.beadroads.com/style/archivetitle02.jpg';
	title_img[2]='http://watarublog.beadroads.com/style/archivetitle03.jpg';
	title_img[3]='http://watarublog.beadroads.com/style/archivetitle04.jpg';
	title_img[4]='http://watarublog.beadroads.com/style/archivetitle05.jpg';
	title_img[5]='http://watarublog.beadroads.com/style/archivetitle06.jpg';
function archivetitles()
	{
	a=Math.floor(Math.random()*title_img.length);
	document.images["imgswitch"].src=title_img[a];
	}